<template>
  <!-- 购物车列表 -->
  <div>
    <div class="cart" v-show="shopCartList.length">
      <h4>全部商品</h4>
      <div class="cart-main">
        <div class="cart-th">
          <div class="cart-th1">全部</div>
          <div class="cart-th2">商品ID</div>
          <div class="cart-th3">单价（元）</div>
          <div class="cart-th4">数量</div>
          <div class="cart-th5">小计（元）</div>
          <div class="cart-th6">操作</div>
        </div>
        <div
          class="cart-body"
          v-for="(shopCart, index) in shopCartList"
          :key="index"
        >
          <ul
            class="cart-list"
            v-for="cartInfo in shopCart.cartInfoList"
            :key="cartInfo.id"
          >
            <!-- 单个商品选中状态 参数 skuId  isChecked-->
            <li class="cart-list-con1">
              <input
                @click="reqChangeOneChecked(cartInfo.skuId, cartInfo.isChecked)"
                :checked="cartInfo.isChecked"
                type="checkbox"
                name="chk_list"
              />
            </li>
            <li class="cart-list-con2">
              <img v-lazy="cartInfo.imgUrl" />
              <div class="item-msg">
                {{ cartInfo.skuName }}
              </div>
            </li>
            <li class="cart-list-con3">
              <div class="item-txt">{{ cartInfo.skuId }}</div>
            </li>
            <li class="cart-list-con4">
              <span class="price">{{ cartInfo.skuPrice }}</span>
            </li>
            <li class="cart-list-con5">
              <!-- 修改商品数量 发送ajax 重新获取数据-->
              <a
                @click="changeShopCartNum(cartInfo, -1)"
                href="javascript:void(0)"
                class="mins"
                >-</a
              >

              <input
                @change="
                  changeShopCartNum(
                    cartInfo,
                    $event.target.value - cartInfo.skuNum,
                    'update'
                  )
                "
                autocomplete="off"
                type="text"
                :value="cartInfo.skuNum"
                minnum="1"
                class="itxt"
              />
              <a
                @click="changeShopCartNum(cartInfo, +1)"
                href="javascript:void(0)"
                class="plus"
                >+</a
              >
            </li>
            <li class="cart-list-con6">
              <span class="sum">{{ cartInfo.skuNum * cartInfo.skuPrice }}</span>
            </li>
            <li class="cart-list-con7">
              <a
                @click="deleteOneCart(cartInfo.skuId)"
                href="javascript:;"
                class="sindelet"
                >删除</a
              >
              <br />
              <a href="#none">移到收藏</a>
            </li>
          </ul>
        </div>
      </div>
      <div class="cart-tool">
        <div class="select-all">
          <input class="chooseAll" type="checkbox" v-model="checkedAll" />
          <span>全选</span>
        </div>
        <div class="option">
          <!-- 批量删除 -->
          <a @click="deleteShopCartAll" href="javascript:;">删除选中的商品</a>
          <a href="#none">移到我的关注</a>
          <a href="#none">清除下柜商品</a>
        </div>
        <div class="money-box">
          <div class="chosed">
            已选择
            <span>{{ shopCartSum }}</span
            >件商品
          </div>
          <div class="sumprice">
            <em>总价（不含运费） ：</em>
            <i class="summoney">{{ shopCartAllPrice }}</i>
          </div>
          <div class="sumbtn">
            <!-- <a class="sum-btn" href="###" target="_blank">结算</a> -->
            <router-link class="sum-btn" to="/trade"> 结算 </router-link>
          </div>
        </div>
      </div>
    </div>
    <div class="NullCart" v-show="!shopCartList.length">
      购物车中没有任何东西，<router-link to="/">快去购买吧</router-link>
    </div>
  </div>
</template>

<script>
import { mapState } from "vuex";
export default {
  name: "ShopCart",
  mounted() {
    /* 调用获取购物车列表 ajax请求 */
    this.getShopCartList();
  },
  methods: {
    /* 发送ajax请求 获取购物车列表 */
    getShopCartList() {
      this.$store.dispatch("reqShopCartList");
    },
    /* 修改商品数量  */
    changeShopCartNum(cartInfo, diffNum, handleFlag) {
      /* 当前商品信息 和差值 */
      if (diffNum < 1 - cartInfo.skuNum) {
        diffNum = 1 - cartInfo.skuNum;
      }
      /* 收集请求参数 */
      let skuId = cartInfo.skuId;
      let skuNum = diffNum;
      // console.log(skuId, skuNum);
      /* 发送修改商品数量请求 */
      this.$store.dispatch("reqAddToCart", { skuId, skuNum });
      /* 重新获取购物车列表 */
      this.getShopCartList();
    },
    /* 删除单个商品 */
    /* async函数中返回的 也是一个Promise对象 也需要使用async await来处理，
    不需要接收返回值可以不写*/
    async deleteOneCart(skuId) {
      try {
        /* 发送删除请求 */
        await this.$store.dispatch("reqDeleteOneCart", skuId);
        /* 重新获取购物车列表 */
        this.getShopCartList();
      } catch (error) {
        alert("删除商品异常,错误信息：" + error.message);
      }
    },
    /* 批量删除 */
    async deleteShopCartAll() {
      /* 收集参数 将所有选中商品的id 添加到skuIdList中 */
      let skuIdList = [];
      this.shopCartList.forEach((item) => {
        item.cartInfoList.forEach((item1) => {
          if (item1.isChecked) skuIdList.push(item1.skuId);
        });
      });
      try {
        /* 发送批量删除请求 */
        await this.$store.dispatch("reqDeleteAllCart", skuIdList);
        /* 重新获取购物车信息列表 刷新数据 */
        this.getShopCartList();
      } catch (error) {
        alert("批量删除操作异常！" + error.message);
      }
    },
    /* 修改单个商品的选中状态 */
    async reqChangeOneChecked(skuID, isChecked) {
      // console.log(skuID, isChecked);
      try {
        /* 请求修改商品选中状态 */
        await this.$store.dispatch("reqChangeOneChecked", {
          skuID,
          isChecked: isChecked ? "0" : "1",
        });
        /* 重新获取购物车列表信息 */
        this.getShopCartList();
      } catch (error) {
        alert("勾选商品异常！！" + error.message);
      }
    },
  },

  computed: {
    /* 
    在计算属性中 使用辅助函数 拿到vuex中state里面的购物车列表信息数据
    (shopCartList，服务器响应的数据) 
    两个名字一样 没有模块化就可以使用数组的方式获取数据
  */
    ...mapState({
      shopCartList: (state) => state.shopCart.shopCartList,
    }),
    /* 计算购物车中选中商品总数量 */
    shopCartSum() {
      return this.shopCartList.reduce((pre, cur) => {
        return cur.cartInfoList
          .filter((item) => item.isChecked == "1")
          .reduce((pre1, cur1) => {
            return (pre1 += cur1.isChecked);
          }, 0);
      }, 0);
    },

    /* 选中商品的总价格 */
    shopCartAllPrice() {
      return this.shopCartList.reduce((pre, cur) => {
        return cur.cartInfoList
          .filter((item) => item.isChecked == "1")
          .reduce((pre1, cur1) => {
            return (pre1 += cur1.skuNum * cur1.skuPrice);
          }, 0);
      }, 0);
    },
    /* 全选反选 */
    checkedAll: {
      get() {
        /* 所有的isChecked为1时 checkedAll才为true 否则为false */
        return this.shopCartList.every((item) =>
          item.cartInfoList.every((item1) => item1.isChecked == "1")
        );
      },
      set(value) {
        /* 收集参数 */
        let isChecked = value ? "1" : "0";
        let skuIdList = [];
        this.shopCartList.forEach((item) => {
          item.cartInfoList.forEach((item1) => {
            // console.log(item1.skuId);
            skuIdList.push(item1.skuId);
          });
        });
        try {
          /* 发送全选请求 */
          this.$store.dispatch("reqChangeAllChecked", { isChecked, skuIdList });
          /* 重新获取购物车列表信息 */
          this.getShopCartList();
        } catch (error) {
          alert("全选操作失败" + error.message);
        }
      },
    },
  },
};
</script>

<style lang="less" scoped>
.cart {
  width: 1200px;
  margin: 0 auto;
  ~ .NullCart {
    text-align: center;
    font-size: 25px;
  }
  h4 {
    margin: 9px 0;
    font-size: 14px;
    line-height: 21px;
  }

  .cart-main {
    .cart-th {
      background: #f5f5f5;
      border: 1px solid #ddd;
      padding: 10px;
      overflow: hidden;

      & > div {
        float: left;
      }

      .cart-th1 {
        width: 25%;

        input {
          vertical-align: middle;
        }

        span {
          vertical-align: middle;
        }
      }

      .cart-th2 {
        width: 25%;
      }

      .cart-th3,
      .cart-th4,
      .cart-th5,
      .cart-th6 {
        width: 12.5%;
      }
    }

    .cart-body {
      margin: 15px 0;
      border: 1px solid #ddd;

      .cart-list {
        padding: 10px;
        border-bottom: 1px solid #ddd;
        overflow: hidden;

        & > li {
          float: left;
        }

        .cart-list-con1 {
          width: 5%;
        }

        .cart-list-con2 {
          width: 30%;

          img {
            width: 82px;
            height: 82px;
            float: left;
          }

          .item-msg {
            float: left;
            width: 150px;
            margin: 0 10px;
            line-height: 18px;
          }
        }
        .cart-list-con3 {
          width: 15%;
        }
        .cart-list-con4 {
          width: 12.5%;
        }

        .cart-list-con5 {
          width: 12.5%;

          .mins {
            border: 1px solid #ddd;
            border-right: 0;
            float: left;
            color: #666;
            width: 6px;
            text-align: center;
            padding: 8px;
          }

          input {
            border: 1px solid #ddd;
            width: 40px;
            height: 33px;
            float: left;
            text-align: center;
            font-size: 14px;
          }

          .plus {
            border: 1px solid #ddd;
            border-left: 0;
            float: left;
            color: #666;
            width: 6px;
            text-align: center;
            padding: 8px;
          }
        }

        .cart-list-con6 {
          width: 12.5%;

          .sum {
            font-size: 16px;
          }
        }

        .cart-list-con7 {
          width: 12.5%;

          a {
            color: #666;
          }
        }
      }
    }
  }

  .cart-tool {
    overflow: hidden;
    border: 1px solid #ddd;

    .select-all {
      padding: 10px;
      overflow: hidden;
      float: left;

      span {
        vertical-align: middle;
      }

      input {
        vertical-align: middle;
      }
    }

    .option {
      padding: 10px;
      overflow: hidden;
      float: left;

      a {
        float: left;
        padding: 0 10px;
        color: #666;
      }
    }

    .money-box {
      float: right;

      .chosed {
        line-height: 26px;
        float: left;
        padding: 0 10px;
      }

      .sumprice {
        width: 200px;
        line-height: 22px;
        float: left;
        padding: 0 10px;

        .summoney {
          color: #c81623;
          font-size: 16px;
        }
      }

      .sumbtn {
        float: right;

        a {
          display: block;
          position: relative;
          width: 96px;
          height: 52px;
          line-height: 52px;
          color: #fff;
          text-align: center;
          font-size: 18px;
          font-family: "Microsoft YaHei";
          background: #e1251b;
          overflow: hidden;
        }
      }
    }
  }
}
</style>